When in doubt Den of Angels is the place to go for any questions you might have. It's an entire forum dedicated to BJDs and they have a pretty good secondhand market, but I'm not sure if they still have that invite-only thing going on with registration. Personally, I don't think you should ever settle when it comes to dolls. If you see something you like, go for it. But make sure you do your homework when it comes to care and maintenance.
As for dolls with pear-shaped bodies. The first that come to mind are maybe DollPamm, Dust of Dolls, and Leekeworld's Mikhaila (not sure what the body she comes on is called unfortunately.) It was a huge trend a while back ago, so you probably shouldn't have any problems finding something you like. Hope that sort of helps.